#define _CRT_SECURE_NO_WARNINGS 1
#include <assert.h>
#include <stdio.h>

size_t my_strlen(const char * str)
{
	size_t count = 0;
	assert(str != NULL);
	while (*str != '\0')
	{
		count++;
		str++;
	}

	return count;
}
int main()
{
	char arr[] = "abcdef";
	size_t len = my_strlen(arr);
	printf("%zd\n", len);

	return 0;
}